linux: Add scx-scheds to optdepends

Peter Jungrequested to merge
ptr1337/linux:scx-opt-depends into main

6.12 has added support for sched-ext schedulers. Inform the user, when installing the linux kernel about the scx-scheds package.

The scx schedulers has been tested against the "linux" 6.12 version.

Signed-off-by: Peter Jung ptr1337@archlinux.org

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